Today's Message Index:
----------------------
1. 07:26 AM - Re: Re: Using the "Poor man's 4-wire milliohmmeter" (Kent or Jackie Ashton)
2. 08:08 AM - Re: Re: ADS-B Antenna (Roger)
3. 08:54 AM - Re: Re: ADS-B Antenna (Robert L. Nuckolls, III)
4. 09:10 AM - Re: Using the "Poor man's 4-wire milliohmmeter" (Robert L. Nuckolls, III)
5. 09:26 AM - Re: Re: ADS-B Antenna (Roger)
6. 12:00 PM - Re: Re: ADS-B Antenna (Robert L. Nuckolls, III)
7. 02:29 PM - Adding a 2nd radio to my 403MC flightcom ()
8. 05:09 PM - Re: Adding a 2nd radio to my 403MC flightcom (user9253)
9. 06:15 PM - Re: Re: Adding a 2nd radio to my 403MC flightcom (rv7a.builder)
10. 07:23 PM - Re: Adding a 2nd radio to my 403MC flightcom (user9253)
Message 1
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| Subject: | Re: Using the "Poor man's 4-wire milliohmmeter" |
AWG 2 Bob. I am doing a few more tests and will post results.
-Kent
> On Aug 3, 2016, at 4:13 PM, Robert L. Nuckolls, III <nuckolls.bob@aeroelectric.com>
wrote:
> What gage wire is used for
> battery and ground leads that
> run the length of the aircraft?
>
> Bob . . .
>
Message 2
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| Subject: | Re: ADS-B Antenna |
There was a recent thread about transponder antennas that might help:
http://forums.matronics.com/viewtopic.php?t=16762861&sid=0fdc43cf144daf
15623736558e046890
I have read that a transponder antenna may also be used for 978 MHZ.
At the iFly booth in OSH, I was impressed by the pinBuddy dual band ADS-B r
eceiver that is a fraction of the size and uses a fraction of the power of
the Stratux.
http://www.uavionix.com/
--------
Joe Gores
Thanks Joe! I was also at OSH and I am seriously looking at the SkyguardT
WX ADS-B unit. It is 2020 compliant, seems to have all the ADS-B features,
can be used with your old style mode C transponder, and is reasonable pric
ed.
Xmit and receive antennas are not included. They recommend using the 978MH
z antenna for the UAT rather than the standard transponder antenna. I belie
ve I will fabricate my antennas since they are simple, using a BNC connecto
r, piece of brazing rod 77mm, and a copper ground plane.
Does anyone have any experience with this device? All comments welcomed.
Roger
Message 3
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| Subject: | Re: ADS-B Antenna |
>
>
>Xmit and receive antennas are not
>included.=C2 They recommend using the 978MHz
>antenna for the UAT rather than the standard
>transponder antenna. I believe I will fabricate
>my antennas since they are simple, using a BNC
>connector, piece of brazing rod 77mm, and a copper ground plane.
Keep in mind that the BNC connector's solder
pot was never intended to be a structural feature.
The moment arm of that antenna mast being buffeted
in the wind imposes a serious stress to the
non-ferrous material . . . which HAS a finite
service life under vibratory stress.
These antennas are not expensive . . .
http://tinyurl.com/zeqau4d
Notice that TED (and others) have
incorporated extra support at the base
of the antenna rod which is, if I recall
correctly, one piece of metal all the way
through. A piece of wire soldered into
the tail-end of a BNC connector will need
some similar attention.
Further, there is little value added for tweaking
the length for 978 Mhz vs. 1050. Recall that
your VHF comm antenna works fine over a range of
118 to 135 Mhz . . . a bandwidth of 7 percent
either side of center. The spread of frequencies
of interest at ADS-B/Xpndr is only 3.5 percent.
Bob . . .
Message 4
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| Subject: | Re: Using the "Poor man's 4-wire milliohmmeter" |
One of my favorite tools for chasing this
dragon (and similar issues) is this modified
battery tester from Harbor Freight.
http://tinyurl.com/jdtw499
In this instance, the device is also used as a high
current load for my test bench . . . you may not want
to cut the leads so short. In any case, this mod
allows you to bolt the load into the system being
evaluated with good mechanical/electrical integrity.
When you strip the wires to attach fat-wire lugs,
be sure to find ANOTHER wire buried in with the
strands of the fat-wire. This is the SENSE wire
for the voltmeter. Strip the sense wire too
such that fat-wire and sense-wire strands
drop into the wire-grip of the terminal.
To troubleshoot integrity of your cranking
circuit, connect (-) lead to crankcase. (+)
lead to the BATTERY side of your starter
contactor. With the master switch ON, you
should read battery voltage. Then crank the
puppy up to some handy value . . . say 150
amps. The voltage should NOT be less than
9v.
The next handy-tool for one-man
diagnostics is a very long set of leads for
your multimeter that will let you clip to
the (-) side of the battery and then take
successive measurements of VOLTAGE at battery(+),
battery side of battery contactor and crankcase
while generating the same, test load as before.
These readings will let you evaluate ground and
supply segments of the cranking circuit INDEPENDENT
of starter controls.
The next test may be a two person test . . . disconnect
the (+) lead from your starter motor and connect
(+) lead of your HF tool to the starter
motor power lead. While someone presses the start
switch in the cockpit, repeat the votlage measurement
under the 150A load. You need to do this with some
dispatch . . . starter contactors should not be
energized for more than 10 second or so without a cooling
period of a minute or so.
Once you have the numbers observed in these
experiments, the combination of conditions that
add up to your perceived performance issue will
be easily deduced.
Using this adjustable, relatively static load
to emulate starter currents allows you to make
meaningful voltage drop measurements . . .
a nearly impossible task when using the starter
as a load.
This tool is also handy for checking your alternator
output. Bolt it into the system, run engine
above minimum rpm for full output . . . crank
up the HF load and demonstrate your alternator's
state of health. Far too many owner/operators
have wasted a lot of time taking alternators
off the airplane and transporting it to some
test facility.
it's a really good thing to KNOW what part
is bad BEFORE you get out the wrenches and
hammers.
Bob . . .
Message 5
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| Subject: | Re: ADS-B Antenna |
=C2-
Xmit and receive antennas are not included.=C3=82=C2- They recommend usin
g the 978MHz antenna for the UAT rather than the standard transponder anten
na. I believe I will fabricate my antennas since they are simple, using a B
NC connector, piece of brazing rod 77mm, and a copper ground plane.
=C2- These antennas are not expensive . . .
http://tinyurl.com/zeqau4d
=C2- Further, there is little value added for tweaking
=C2- the length for 978 Mhz vs. 1050. Recall that
=C2- your VHF comm antenna works fine over a range of
=C2- 118 to 135 Mhz . . . a bandwidth of 7 percent
=C2- either side of center.=C2- The spread of frequencies
=C2- of interest at ADS-B/Xpndr is only 3.5 percent.
You convinced me. I will buy the antennas. In looking
further on Ebay, the 978MHz antenna is only $=C2=BD more
so I think I will spring for the difference.
I plan to mount these inside an all wood fuselage. Do you
see any problem with that?
Roger
Message 6
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| Subject: | Re: ADS-B Antenna |
>You convinced me.=C2 I will buy the antennas.=C2 In looking
>further on Ebay, the 978MHz antenna is=C2 only $=C2=BD more
>so I think I will spring for the difference.=C2
>
>I plan to mount these inside an all wood fuselage.=C2 Do you
>see any problem with that?
Nope. Mount them on circles of aluminum
with a diameter of 6". Mount them pointing
down . . .
Bob . . .
Message 7
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| Subject: | Adding a 2nd radio to my 403MC flightcom |
Hello Group, I would like to add a 2nd radio to my Flightcom 403mc without
installing an audio panel. I think if I use a switch to separate the mike k
ey and mike audio between the 2 radios for transmitting purposes that would
work, but can I just turn down the volume on either radio instead of separ
ating the phone audio? If I am listening to atis on one radio and then a tr
ansmission comes in on the other will there be an overload problem? Thanks
John Robinson RV-7A 90 hours.=C2-
Message 8
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| Subject: | Re: Adding a 2nd radio to my 403MC flightcom |
Do you want to listen to both radios at the same time or only one at a time?
Do you intend to listen to music or other audio on the aux input, pin 18?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=459219#459219
Message 9
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| Subject: | Re: Adding a 2nd radio to my 403MC flightcom |
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Message 10
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| Subject: | Re: Adding a 2nd radio to my 403MC flightcom |
The audio output from two radios should not be connected together without some
kind of isolation.
The audio from the second radio could connect to pin 18 on the intercom, the
music aux input. But switching the intercom to "isolate" will disable it.
Audio input on pin 21 will mute the audio input on pm 18 unless the wire connected
to pin 24 is cut.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=459221#459221
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